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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2001208c | 2 | |
8b516fde | 3 | #include "sd-hwdb.h" |
07630cea | 4 | |
b5efdb8a | 5 | #include "alloc-util.h" |
8b516fde | 6 | #include "hwdb-util.h" |
07630cea | 7 | #include "libudev-private.h" |
2001208c KS |
8 | |
9 | /** | |
10 | * SECTION:libudev-hwdb | |
11 | * @short_description: retrieve properties from the hardware database | |
12 | * | |
f2d433e1 | 13 | * Libudev hardware database interface. |
2001208c KS |
14 | */ |
15 | ||
16 | /** | |
17 | * udev_hwdb: | |
18 | * | |
19 | * Opaque object representing the hardware database. | |
20 | */ | |
21 | struct udev_hwdb { | |
3c6ac219 | 22 | unsigned n_ref; |
8b516fde | 23 | sd_hwdb *hwdb; |
2001208c KS |
24 | struct udev_list properties_list; |
25 | }; | |
26 | ||
2001208c KS |
27 | /** |
28 | * udev_hwdb_new: | |
b485aa58 | 29 | * @udev: udev library context (unused) |
2001208c KS |
30 | * |
31 | * Create a hardware database context to query properties for devices. | |
32 | * | |
33 | * Returns: a hwdb context. | |
34 | **/ | |
35 | _public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) { | |
4afd3348 | 36 | _cleanup_(sd_hwdb_unrefp) sd_hwdb *hwdb_internal = NULL; |
2001208c | 37 | struct udev_hwdb *hwdb; |
8b516fde | 38 | int r; |
2001208c | 39 | |
8b516fde | 40 | r = sd_hwdb_new(&hwdb_internal); |
309f631d LP |
41 | if (r < 0) { |
42 | errno = -r; | |
2001208c | 43 | return NULL; |
309f631d | 44 | } |
2001208c | 45 | |
68b80b85 | 46 | hwdb = new(struct udev_hwdb, 1); |
309f631d LP |
47 | if (!hwdb) { |
48 | errno = ENOMEM; | |
2001208c | 49 | return NULL; |
309f631d | 50 | } |
2001208c | 51 | |
68b80b85 YW |
52 | *hwdb = (struct udev_hwdb) { |
53 | .n_ref = 1, | |
54 | .hwdb = TAKE_PTR(hwdb_internal), | |
55 | }; | |
2001208c | 56 | |
8b516fde | 57 | udev_list_init(udev, &hwdb->properties_list, true); |
2001208c | 58 | |
2001208c KS |
59 | return hwdb; |
60 | } | |
61 | ||
3c6ac219 YW |
62 | static struct udev_hwdb *udev_hwdb_free(struct udev_hwdb *hwdb) { |
63 | assert(hwdb); | |
64 | ||
65 | sd_hwdb_unref(hwdb->hwdb); | |
66 | udev_list_cleanup(&hwdb->properties_list); | |
67 | return mfree(hwdb); | |
68 | } | |
69 | ||
2001208c KS |
70 | /** |
71 | * udev_hwdb_ref: | |
72 | * @hwdb: context | |
73 | * | |
74 | * Take a reference of a hwdb context. | |
75 | * | |
76 | * Returns: the passed enumeration context | |
77 | **/ | |
2001208c KS |
78 | |
79 | /** | |
80 | * udev_hwdb_unref: | |
81 | * @hwdb: context | |
82 | * | |
83 | * Drop a reference of a hwdb context. If the refcount reaches zero, | |
84 | * all resources of the hwdb context will be released. | |
85 | * | |
725d7e6c | 86 | * Returns: #NULL |
2001208c | 87 | **/ |
3c6ac219 | 88 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(struct udev_hwdb, udev_hwdb, udev_hwdb_free); |
2001208c | 89 | |
2001208c KS |
90 | /** |
91 | * udev_hwdb_get_properties_list_entry: | |
92 | * @hwdb: context | |
93 | * @modalias: modalias string | |
94 | * @flags: (unused) | |
95 | * | |
96 | * Lookup a matching device in the hardware database. The lookup key is a | |
97 | * modalias string, whose formats are defined for the Linux kernel modules. | |
98 | * Examples are: pci:v00008086d00001C2D*, usb:v04F2pB221*. The first entry | |
99 | * of a list of retrieved properties is returned. | |
100 | * | |
101 | * Returns: a udev_list_entry. | |
102 | */ | |
103 | _public_ struct udev_list_entry *udev_hwdb_get_properties_list_entry(struct udev_hwdb *hwdb, const char *modalias, unsigned int flags) { | |
8b516fde | 104 | const char *key, *value; |
309f631d | 105 | struct udev_list_entry *e; |
2001208c | 106 | |
8b516fde | 107 | if (!hwdb || !modalias) { |
2001208c KS |
108 | errno = EINVAL; |
109 | return NULL; | |
110 | } | |
111 | ||
9485d98d | 112 | udev_list_cleanup(&hwdb->properties_list); |
8b516fde | 113 | |
0b931571 | 114 | SD_HWDB_FOREACH_PROPERTY(hwdb->hwdb, modalias, key, value) { |
8b516fde TG |
115 | if (udev_list_entry_add(&hwdb->properties_list, key, value) == NULL) { |
116 | errno = ENOMEM; | |
117 | return NULL; | |
118 | } | |
2001208c | 119 | } |
8b516fde | 120 | |
309f631d LP |
121 | e = udev_list_get_entry(&hwdb->properties_list); |
122 | if (!e) | |
123 | errno = ENODATA; | |
124 | ||
125 | return e; | |
2001208c | 126 | } |